For the purpose of this investigation, we have chosen as substrate sand and loess, because of great difference in characteristics—permeability and porosity that is caused by granulometric composition of the same. One of the most important reasons is that the fertile soil on which intensive agricultural production is taking place, is based on loess, and that causes constant maceration of soil by introducing artificial fertilizers. Solubility of NaNO3 is big, so the fertilizers go over in solution when in soil is enough water. In case that the quantity of water in soil is big, and that their prevail decedent costs, there is present danger that nitrate will be washed out and in deeper layers. For this reason we need to evade adding great quantity of NaNO3, as well as the other fertilizers that contain nitrogen in the form of nitrate. Washing out nitrates from soil comes as a result of their solubility and because of the fact that soil has not the capability to bond them chemically or physically chemically. Nitrates do not build unsuitable salts with neither cat ion of soil, and on the surface of colloid particles they can not to adsorb. On the basis of this, we can conclude that 3 NO ion does not bond in soil, and when the water is presented, it is washing out because the climate is more humid (more rainfalls or we use irrigation) and this causes greater washing out and smaller retaining nitrates in sandy soil, in comparison with loess where retaining is greater, that is confirmed with experiments. When it is about soil, the harder mechanical composition is (more clay), the smaller will be the capability of soil to pass water and it comes to smaller washing out and greater retaining, because in soil dominate smaller pores and water moves slowly. Loess contains more dust and clay, the porosity of soil is smaller, so filtering here is slower than sanding. Because of that are, for example quantities of nitrate fertilizers that are given on sandy soil in one move smaller than on soil of harder mechanical composition